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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_007_726">&nbsp;</a>NAME</h4><blockquote>
mq_close - close a message queue
(<b>REALTIME</b>)
</blockquote><h4><a name = "tag_000_007_727">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="mqueue.h.html">mqueue.h</a>&gt;

int mq_close(mqd_t <i>mqdes</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_007_728">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>mq_close()</i>
function removes the association between the message queue descriptor,
<i>mqdes</i>,
and its message queue.
The results of using this message queue descriptor after successful
return from this
<i>mq_close()</i>,
and until the return of this message queue descriptor from a subsequent
<i><a href="mq_open.html">mq_open()</a></i>,
are undefined.
<p>
If the process has successfully attached a notification request
to the message queue via this
<i>mqdes</i>,
this attachment will be removed,
and the message queue is available
for another process to attach for notification.
</blockquote><h4><a name = "tag_000_007_729">&nbsp;</a>RETURN VALUE</h4><blockquote>
Upon successful completion, the
<i>mq_close()</i>
function returns a value of zero;
otherwise, the function returns a value of -1 and sets
<i>errno</i>
to indicate the error.
</blockquote><h4><a name = "tag_000_007_730">&nbsp;</a>ERRORS</h4><blockquote>
The 
<i>mq_close()</i>
function will fail if:
<dl compact>

<dt>[EBADF]<dd>
The
<i>mqdes</i>
argument is not a valid message queue descriptor.

<dt>[ENOSYS]<dd>
The function
<i>mq_close()</i>
is not supported by this implementation.

</dl>
</blockquote><h4><a name = "tag_000_007_731">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_007_732">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_007_733">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="mq_open.html">mq_open()</a></i>,
<i><a href="mq_unlink.html">mq_unlink()</a></i>,
<i><a href="mqueue.h.html">&lt;mqueue.h&gt;</a></i>,
<i><a href="msgctl.html">msgctl()</a></i>,
<i><a href="msgget.html">msgget()</a></i>,
<i><a href="msgrcv.html">msgrcv()</a></i>,
<i><a href="msgsnd.html">msgsnd()</a></i>.
</blockquote><h4>DERIVATION</h4><blockquote>
Derived from the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995)
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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